A395673 The first (2*n-1)-digit palindromic prime occurring in the decimal expansion of Pi.

3, 383, 38183, 9149419, 318272813, 74670707647, 1020776770201, 176860696068671, 30948834143884903, 7240428184818240427

Offset

1,1

Links

Table of n, a(n) for n=1..10.

GitHub, Pi Prime Palindromes Challenge.

Example

a(1) = 3, because the first 2*1-1 = 1 digit of the decimal expansion of Pi is a palindromic prime.
a(2) = 383, because the first palindrome with 2*2-1 = 3 digits occurring in the decimal expansion of Pi = 3.141592653589793238462643383... that is prime is 383.

Crossrefs

Cf. A000040, A000796, A002385, A104841, A104842, A279885, A395703.

Sequence in context: A317069 A316950 A317730 * A193131 A193154 A120061

Adjacent sequences: A395670 A395671 A395672 * A395674 A395675 A395676

Keyword

nonn,base,hard,more

Author

Jean-Marc Rebert, May 03 2026

Status

approved